Georg kalischer and heinrich salkowski



v limited thereto.

- Patented Sept. 23, 1924.

ass-as GEORG KALISCHER AND HEINRICH SALKOWSKI, OF MAINKTTRr WEAR Fl-h iifKFORT- ON-THE-MAIN, (HERIVLANY.v

DICHLORINATED DERIVATIVE OF- THE N-DIHYDRO-1,"2,2, P-ANTHIMKQUINUNE-AZINE AND A NEW PROCESS FOR MAKING SAME. I i

i No Drawing.

'1 a full description.

From the hitherto known chlorinated derivatives of the N -dihydro 1, 2, 2 1 an.- thraquinoneazine only the trito tetrachlorderivatives possess a suilicientfastness to chlorine. The object matter of our invention 1s: a new method of chlorinating N-dihydro '1, 2, 2 ,1 anthraquinoneazine and a new chlorinated derivative thereof which coni tains in its molecule only two atoms of {29 chlorine and possessing an excellent fastness to chlorine much superior to all dichlomed derivatives hlitherto known, and fully iii l i thi rgspect and in brightness of shade to the well known triand tetra- "fhalogenated' derivatives, over which it has 'jl owever the great advantage that it may i'llSO be dyed in hard water;

Our rocess consists in finely distributing -N-dihy to 1,2, 2 1 anthraquinoneazine in 0 molten sulfur and then all-owing'chorine to act on it at temperatures above the boiling 1. point of disulfurdichloride, preferably above 200 C. and at ordinary pressure. This new method for chlorinatmg not yet applied runs probably in this way that at I "first-disulfurdlchloride is formed, which reacts immediately in statu nascendl on the N-dihydro 1, 2,2 ,'1 anthraquinoneazine 7 yielding thus the new dichlorina-ted deriva- 314 tive thereofposse'ssing the above mentioned excellent properties of dyem andfastness.

The addition of' a suitab e catalyzerfas iodine, chloride of mercury andso forth ac- ;celerates the process of chlcrmatmg.

- In carrying outour process we proceed for instance as follows, but the invention is not Example. I

m 75. kilos ofsulfur are heated to the melting point, 10 kilos of N-dihydrod, 2, 2 1 '-an-' ish olive color. chlorine which corresponds .to a dichlor-N- Application filed April 10, 1924. Serial No. 705,852.

thraquinoneazine (indanthrene blue RS) are then added while stirring well, the tern-- perature of the mass being then raised-to 210220 O." and a stream of chlorine allowed to pass slowly through it. The rate of the introduction of chlorine into the mixturc should be so regulated that the liOIIIliL-a tion of a considerable excess of disulfurdichloride is as far as possible avoided. When the evolution of hydrochloric acid, which at the beginning of the reaction is rather vigorous, decreases (mostly, after 6 to 8 hours duration of the reaction), the disulfnrdi chloride which may have: formed, is blown or drawn oil, and the mass after allowin to cool is then'powdered. The sulfur is t en removed in the usual manner for instance by digesting the mass with a sodium sulfide so lution whereby the sulfur is dissolved and the green dichlorinated azine is reduced to the blue colored hydroazine. It is thus obtained in afinely divided state, being easily soluble in the hydrosulfite vat with a blue color and dyeing cotton even in hard water bright greenish-blue shades fast to chlorine. In the dry state it is a blue powder diflicultly soluble in the usual organic solvents, soluble in concentrated sulfuric acid with a brown It contains about 13.5%

dihydro 1 2, 2 1 anthraquinoheazine. Sui fur is not to be found in the new product.

aving now particularly described and ascertained the nature of our said invention; 8 and in what manner the same to be per formed, we declare, that what we claim is:

1. The manufacture or production of 54 new dichlorinated N-dihydrc 1, 2, 2 1 an thraquinoneazine which consists in allowing chlorine to act on N-dihydro 1, 2-, 2 l" anthraqninoneazine in a medium of molten sulfur at temperaturesabout 200 C. and at p ordinary pressure.

2. As a new article of manufacture the dichlorinated N dihydro .1, 2, 2 1? anthraquinoneazine produced from N-dihydro 1, 2, 2 1 anthraquin-oneazine by treatingit in a medium of molten sulfur at temperatures about 200 C. with chlorine,being in th dr'y state a blue powder difiicultlyso uble in the usual organic solvents, soluble in concen--.

:trated sulfuric acid with a brownish olive signed our names this 28th day of Man-l1,

color, solublewith an alkaline hydrosulfide 1924. l 1w;

solution to 'a blue colored vat and dyeing cotton bright greenish blue shades which are 5 distinguished by their excellent fastness to ehl ri'ne, equalin this respect to the triand tetlia-ehlfixinated derivatives.

In .witness whe eof We have hereunto GEOR-G KALISCHER.

HEINRICH SALKOYVSKL 7 itnesses:

IAUE GUETII, GALERO G. FLESCI-I. 

